CVE-2021-33266 Explained : Impact and Mitigation
Learn about the CVE-2021-33266 affecting D-Link DIR-809 devices with firmware versions through DIR-809Ax_FW1.12WWB03_20190410, allowing remote code execution via crafted requests.
This CVE-2021-33266 article provides detailed information about a stack buffer overflow vulnerability affecting D-Link DIR-809 devices with firmware through DIR-809Ax_FW1.12WWB03_20190410, triggered by a crafted POST request.
Understanding CVE-2021-33266
This section outlines the impact and technical details of the CVE-2021-33266 vulnerability.
What is CVE-2021-33266?
D-Link DIR-809 devices with specific firmware versions were found to have a stack buffer overflow vulnerability in the function FUN_8004776c in /formVirtualApp, exploitable via a crafted POST request.
The Impact of CVE-2021-33266
The vulnerability could allow remote attackers to execute arbitrary code or cause a denial of service by sending malicious requests to the affected devices.
Technical Details of CVE-2021-33266
This section provides insight into the vulnerability's description, affected systems, and the exploitation mechanism.
Vulnerability Description
The identified stack buffer overflow vulnerability in D-Link DIR-809 devices could be exploited through specially crafted POST requests.
Affected Systems and Versions
D-Link DIR-809 devices with firmware through DIR-809Ax_FW1.12WWB03_20190410 are impacted by this vulnerability.
Exploitation Mechanism
By sending a maliciously designed POST request to the affected device, threat actors can trigger the stack buffer overflow and potentially execute arbitrary code.
Mitigation and Prevention
This section offers guidance on mitigating the risks associated with CVE-2021-33266 and implementing security measures.
Immediate Steps to Take
Device owners are advised to apply security patches promptly, restrict network access, and monitor for any suspicious activities.
Long-Term Security Practices
Implementing network segmentation, regularly updating firmware, and conducting security assessments can enhance the overall security posture.
Patching and Updates
Users should regularly check for firmware updates from D-Link and apply patches to address known vulnerabilities.